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Malleable iron pipe union, 3/8 inch FNPT, Class 150, dark metal finish

Value Brand

Value Brand Union 3/8" FNPT Malleable Iron Class 150

SKU CH-RN59-PVK40

A 3/8 inch female NPT malleable iron union rated for Class 150 pressure service

  • Malleable iron construction resists cracking under pressure
  • Class 150 rating handles standard plumbing demands
  • Female NPT threads create secure pipe connections
  • 3/8 inch size fits common residential lines
  • ZORO SELECT brand ensures consistent manufacturing quality

3/8" FNPT Malleable Iron Union

The Value Brand Union 3/8" FNPT Malleable Iron Class 150 is a pipe fitting designed to join two sections of threaded pipe. It suits plumbers and maintenance technicians who need a removable connection point in low-pressure water, air or gas lines. The malleable iron body provides mechanical strength for general-purpose service.

Class 150 pressure boundary

Class 150 designates the maximum working pressure for this fitting at standard temperatures. The 3/8-inch female NPT threads on both ends accept matching male pipe threads sealed with tape or paste. Service beyond the rated pressure or with incompatible media risks joint failure and leakage.

Threaded assembly with sealant

Installation requires cleaning the male threads, applying thread sealant and tightening the union nut to align the gasket faces. Misaligned pipes, damaged threads or insufficient sealant are the usual causes of leaks. The union nut allows disassembly without rotating the connected pipe runs.

How it compares

Measured against everything we stock in Hose Fittings, Adapters & Clamps, at today’s prices. Recalculated every night.

Price $5.99
Cheaper than about 80% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameZORO SELECT

Questions about this item

Which size and pressure class of malleable-iron union should I select for a 3/8-inch NPT line?

Choose the 3/8-inch FNPT malleable-iron union rated Class 150 to match your pipe size and pressure requirement.

What does the Class 150 rating mean once the union is installed?

Class 150 indicates the union is rated for up to 150 psi working pressure at ambient temperature in a properly assembled joint.

How does the female NPT thread standard affect what I can connect?

The FNPT threads accept any 3/8-inch male NPT pipe or nipple, sealing with thread tape or compound on the tapered threads.

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